I use wifi smart plugs and just set the bios to power on on power loss. If the pool notifies me the miner is down I try teamviewer, if I can't get it I shut the outlet off for a minute and back on, works pretty good and for less than $20
I have the same system you told but, what if you are sleeping and rig freeze?
You cannot do anything and lose money, is that why a watchdog will be better, it will restart automatically.