Classic wisdom is hardwire FTW.   That being said its not always practical. 

I have 5 antminers that Im running off of 2 WIFI routers in bridge mode (repeater) which seems to work just fine.  Just make sure your not placing anything in a dead spot with questionable wifi.

If only costs you $30 to try it.   If you start seeing rejected packets or high latency, reconsider your location or equipment.