Same issue as the OP but on the left side.
Arrived at this camp site and the left side was pushed in. Took the 4 screws that hold the front plate to the cabinet off and pulled the microwave out. The 2 screws on the left that hold the mounting/face plate to the microwave were missing and on the right, one screw was missing and the other one was loose. They used self-drilling sheet metal screws and from the bouncing down the road they worked the holes bigger and came loose. I am worried if I put the next size screw in they will again just work loose over time making the hole even bigger. I found one thread where someone used pop rivets to fix this but I am wondering if they too will work themselves loose. Others must have had this issue and I am sure many more will, what did you do to fix this and how long has it lasted?
2016 Windjammer 3006WK
2010 Dodge Ram 2500, 4x4, Diesel, Front Hitch, Air Lift 5000 Rear Air Bags, (not really used, left over from our truck camper). Equalizer E4 1.4k/14k WD Hitch. TST 507 TPMS. Furrion FOS48TA Observation Camera. Garmin RV-760 GPS. Honda 2000i Genny, PI EMS-PT30C.