We currently have a dualpurpose gym/sanctuary and I have 3 PTZ cameras in there. Looking for wall mountable enclosure to protect them from ball strikes and the like.
It sounds like you're doing the right thing by protecting them in such a fashion.
Currently the only product I know 100%works for this purpose is from a company called Dotworkz and is their D2 model.
Being indoors you likely only need the base model with none of the heating or cooling features.
I do know some of our clients have custom built their own solutions using cages where they have cut out the areas they typically would be viewing through with great success
Unfortunately I do not have any information, beyond the above, on creating one of those solutions but felt it worth mentioning.
I hope this information is helpful and if you have any additional questions please don't hesitate to come back and ask.