I don't think Quinn is involved in the hidden camera, you have to remember that whoever controls that camera sent the pictures of Arieth to Dawe and whatever was in the envelope to Chad. Quinn has no reason to try and get rid of the Alphas, while Chad is not going to be a customer (for obvious reasons) we know Dawe is probably a customer of the restaurant (we see Rio giving Dawe a lapdance when Maya gives us the tour of the campus).
To have Quinn as the source of the hidden camera you need a motive for her to blackmail Chad and get Dawe very mad. Also if the contents of Chad's envelope is similar to Dawe's then it's likely the photos were of him and Troy together, my guess would be they were taken from the gym changing rooms (which is why Chad immediately blamed MC having seen him acting suspiciously around the changing rooms), making the sender of the photos the same person who also used the DIKs rooster account to leak the changing room photos of Cathy.
Also the hidden camera looks more like a CCTV camera than a usual spycam (DAZ does have assets for spycams so DPC made a deliberate choice to use an asset that looks like a CCTV camera). So by that I think the suspect needs to have access to CCTV cameras, I don't think Quinn has that access.
There is however a school administrator (who would have access to school supplies including CCTV cameras) who has been shown to have (probably remote) access to the DIKs laptop having been able to get access to a video that was uploaded onto the laptop and hasn't been posted anywhere else. As for Burke's motives for wanting rid of Chad and Dawe, if they know that Chad is having an affair with Troy then they're probably rather pissed off at him given he is meant to be their daughter's boyfriend and would want revenge on him. Dawe is totally unsuitable as a frat leader, no intelligence and a very short fuse are not a good mix, so they tried to rile him up as well as an excuse to expel him too. Unfortunately for them Cathy advocated for Chad to prevent him getting expelled and then Chad was able to talk Dawe out of getting expelled. But then that made Cathy the next target to be got rid of, which was done successfully with the leaked photo.