My approach would be to use a Hubitat (powered with POE) and mesh the garage door sensors (or whatever sensors you plan to use) to your C8. @dennypage did some impressive work with POE switches and Hubitat (See here). I have 3 of these garage door tilt sensors and they have worked very well for a few years now.
Edit : I forgot to mention that I did replace the ball tilt switches in these garage door tilt sensors with mercury switches. (see here)
