Hey, without knowing your voc and level it's hard to be specific, but I'm going to assume you're asking for low level since they're the ones that hunt invisibles.
Stonerefiner:
East of venore, deep in the Corym Mines, here. I think this is one of the best respawns for go invisible. Nice exp and loot. Just take care, lot of random pk usually go here. You can go single target or with avas.
Monsters: Stonerefiner
Protections: physical, earth
Attack with: physical (120%) and ice (120%)
More details: https://tibia.fandom.com/wiki/Stonerefiner
Cyclops:
Really nice respawn for low levels. You can up easilly to level 20-28. You can go Cyclopolis Edron respawn (you dont need any access) or Yalahar - Mistrock respawn (you need yalahar access quest). Nice exp, bad loot. You can go single target
Monsters: Cyclops, Cyclops drone, Cyclops smith
Protections: physical
Attack with: death and earth
More details: https://tibia.fandom.com/es/wiki/Cyclopolis (Edron respawn) // https://tibia.fandom.com/es/wiki/Mistrock (Yalahar respawn)
Tortoises and blood crabs:
Really nice respawn for low levels. You can hunt single target but is better go on level 28 with thunders. If you ek you can go too. You will need acess to meriana quest https://tibia.fandom.com/wiki/The_Shattered_Isles_Quest/Spoiler (only "access to Meriana" part).
Lot of money with turtle shell and bloody pincers. No monsters here will see you if you are invisible. Also nice exp.
Monsters: Blood Crab, Thornback Tortoise, Tortoise
Protections: physical and earth
Attack with: fire (110%) energy (105%)
More details: https://tibia.fandom.com/wiki/Laguna_Islands
Coryms:
Good place for exp. Bad loot. Better hunt here with avas or gfb. Take care with corym vanguard because they see invisible people. At least there are very few. Respawn is located in a cave at the east of Venore.
Monsters: Corym Charlatan, Corym Skirmisher, Corym Vanguard
Protections: physical, earth and death
Attack with: holy (105%), fire (100%), ice (100%), physical (100%)
More details: https://tibia.fandom.com/wiki/Corym_Mines
Gloom wolfs:
Really nice respawn for make money on low levels. There is not much mystery in this respawn, it is a cave with wolves that give little experience but they drop Gloom Wolf Fur that is worth a lot. Only Gloom Wolfs give "Gloom wolf fur". You can go single target or with avas/gfb. The respawn is close to Amazon camp, in a cave north-west.
Monsters: Gloom Wolf, Ghost Wolf
Protections: physical and life drain
Attack with: holy (105%), fire (105%), ice (105%)
More details: https://tibia.fandom.com/wiki/Poacher_Caves/Gloomy
Upper spike:
Really nice respawn for exp from level 30. Only Corym Vanguard can see you in this respawn. You have to hunt with avas and gfb as in some areas there are monsters that avas or gfb do not affect. The demon skeleton is affected 0% by fire, the zombie 0% by ice. The others are affected by both. Not good respawn to go single target. Respawn is passing a tp in Kazordoon, close to warzone tp. Here the best is not to go all the time with the ring, you go killing monsters throwing them avas or gfb and if you are in danger you wear the ring.
Monsters: Gargoyle, Mummy, Ghost, Crypt Shambler, Corym Skirmisher, Corym Charlatan, Corym Vanguard, Enraged Soul, Demon Skeleton, Zombie
Protections: physical, death, earth, life drain
Attack with: ice and fire
More details: https://tibia.fandom.com/wiki/Upper_Spike
Source: own experience and https://tibia.fandom.com/