spova, the three boards I’ve used all had standard mounting holes, so could be attached with bolts if one so wished. With my R15 and H743MINI boards I mounted them inside custom-made housings using bolts and isolators, and then attached the housings using 3M or similar mounting tape. My H743WING board has a nice flat underside so I mounted it directly with 3M mounting tape. I did try Kyosho gel mounting tape for the H743MINI, which the ardupilot wiki says is the best for vibration isolation but, mounted on the vertical side of the heli frame, it became unstuck as I was preparing for a flight 
FRED_GOEDDERT, I’m a few years older than you and, apart from initially struggling to get arducopter onto them, I’ve had no issues with my Matek boards other than those mentioned in this thread. Maybe this thread will help you if that’s your problem with your Matek boards. The final post there details my successes.