Use my existing modem/router with Ring Pro

I'm replacing a gen1 ring base unit with a Ring pro. I have an all-in-one modem/router that I lease from our internet provider. I like it. It has great range and if something ever goes wrong with it, they have to fix it.So can I use a Ring Pro base unit with my existing modem/router, without using the Ring Pro as the router? Basically I want to set it up just like the Gen1 Ring base unit where it just connects to my existing router.