I'm using a Netgear 1121 as a backup WAN link - the connection isn't always perfect, but I think that's more a function of a flaky 4G/LTE link versus the hardware. (Admittedly, it can be difficult to distinguish.)
I have been using one of these:
https://smile.amazon.com/gp/product/B00346USOA/
for several years now to power cycle modems/gateway devices when a remote ping fails for a few minutes.