Using r7000 as expressVPN and Orbi as home router

I plan to add expressVPN to my network. I currently use the Orbi RBR20 router and 2 satellies for my home network. I have a R7000 WiFi router that was replaced by the Orbi router and satellites. I have turned off the wifi on the R7000 and set it to AP mode to have access to its ReadySHARE ability. I learned that the R7000 supports expressVPN but Orbi does not. Can I place the R7000 between my fios network and the orbi router and still maintain the configuration such as IP address reservation I set up on the Orbi router?