I would ask the vet if he neuters gliders on a regular basis. If he has done many of the procedures, he will likely describe his methods to you. You can also ask if any of the gliders he has neutered had complications or required an e-collar afterward.
If the vet says many of the gliders he as neutered had problems after surgery - choose another vet.
I have had 3 gliders neutered by an experienced vet. She uses a long acting pain medication applied to the surgical area before she closes with surgical glue. By the evening after the surgery the boys acted as if nothing had happened. Other than their usual grooming when they wake up, they ignored the surgical site. They ate well that night and had no problems.