Please ask your vet to do the following which is considered a best practice amongst vets that do many, many sugar glider neuters:
1. DON'T shave the surgery site. That just causes them and others to be more interested in "picking"
2. Give him pain medication after surgery so he will be woozy and less likely to pick at his wound
3. Keep him overnight at the vet if they have that service so they can get to him quicker than you can if
complications arise
As to whether or not to put him back with the others right away... that depends on the surgery site. I don't care if its laser surgery or traditional surgery - both can produce swelling and irritation, or if the surgery is not expert, a long and wide cut. If the surgery site has even a HINT of an abnormal look about it, keep him separate until the wound is completely healed and fur has grown back. When it looks completely normal, then you can put him back.