I understand you very well. I also have a bike, and I love riding it, especially on nights. The only problem is the light on aero road bars. I`ve been searching for this type of light for weeks, even months, and I didn`t find anything. It is very dangerous to ride a bike at night without a light.

Do the Wahoo plates also work with Garmin computers or do I need to replace the plate with a Garmin specific one?

Both versions are available from that manufacturer, that said...

The plates are the same, but turned 90⁰ from one another, so either would mount sideways on the opposite mount. I moved from Wahoo over to Garmin since buying the pictured mount, and was able to unscrew, turn and remount the adapter plate to accommodate my 530 - the mount had appropriate threadings and the screws were just long enough (and I used thread locker for extra peace of mind).