Some golden tips:
- Make sure your account looks legit enough like a main that is capable of having these UCs.
- Do it slowly! Don't transfer four UCs in one week onto your account. Spread it out.
- Look like you take care of your pets: customization, lookup, etc.
- You're already planning to do this but yes, stay away from the PC.
Also, try to get the pet from a reputable seller.
Might want to try buying PC unknown pets so lesser people will know about the existence of your pet.
So long as you don't shove them all on your main at once and stay clear of the boards, you should be fine. I would personally spread those purchases out over six months, based on what has worked for me. If the pet's off an inactive, invest in a good VPN and slowly begin making that account active again (play a few games, get a few avatars, etc.) before transferring your pet to one of your accounts. If the pet's off a seller's personal account, transferring right to your account should be alright, if they've kept active themselves.
I would suggest not using a new account that you created as well. New accounts tend to be on TnT's radar and moving pets to it will get you frozen pretty quickly. I'd try to buy a decent main here and start playing on it. After you've played on it for a month or two you could start moving your UCs on to it. One at a time with about a month or so gap in between.
I wouldn't bother using the boards unless you need to, and if you do I would wait until after you have 1-2 UCs on your account. If you were to post beforehand, someone might remember your UN and see you now have all of these UCs a couple months later. I'd keep a non-UC as your active pet as well.
The money you're going to spend on UC pets you may as well buy a nice main to stick them on...or even a semi main so you can still work at increasing av account etc