AC797 and AC810 as failover

Greetings All

Happy New Year.

I'm looking for a mobile router that I can use as a broadband failover (when my VDSL line drops) and as a mobile router when going on holiday. 

So, just a question: can either AC797 or AC810 be used as failover modems running on AC power, i.e. being connected to the mains (but, with the battery being removed to avoid situations when batteries swell/explode)?

Thank you.