I think it is good that you are recognizing that you are or may be at your limit.

I had 4 cats in a 2 bedroom apartment, without the landlord's OK. It wasn't "crowded" until my Dad moved in, ha ha ha! The landlord was a big company, and that was always a worry for me. So in terms of size, I think your home is big enough for 7 or 8.

Sounds as though you have looked at all aspects - emotional support for all of them, time, finances, living situation. You are not just working on impulse, and that is important to keep in mind. You ARE thinking this through. Good for you.