Let me add a bit, even though its not AirVPN related and so is going off path. An experiment I plan to try here when that Netflix sharing problem arises is to have the (dd-wrt) router at the main location run a wireguard server and have the remote Android TV connect to it using the WireGuard (client) app. No commercial VPN provider would be involved, so the usual IP-address checks used by Netflix will turn up nothing of interest. All Netflix watching, from either location, will appear to be at the main location. You could do it all in the OpenVPN world instead, but I find wireguard much simpler to deal with.
Note that dd-wrt routers except really old/small ones can run an OpenVPN or wireguard client to AirVPN as well or even, once you are more advanced in the dd-wrt arts, multiple clients/servers at once.
At present the Linksys EA7500 is not supported by the dd-wrt project. The better bets for dd-wrt are the Netgear R7800 or, redone in modern packaging with modern prices, the XR450 and XR500. In the Linksys world, the older WRT3200ACM and WRT1900ACS models are the best bets, if you can find them (but shun the WRT32X). Random online articles on installing dd-wrt are apt to be seriously out of date, so start your reading instead in the dd-wrt forums, either the Atheros one (Netgear) or Marvell one (Linksys), particularly the "Sticky posts" at the top and the "new build" threads. Ignore the router database, as it's not well maintained. Advice: if you think dd-wrt is a one-afternoon project... I'm sorry, I can't stop laughing! The capability it offers is amazing, but figure it's a new hobby.
Some of the Asus routers either have or can be backfitted with wireguard capability. Google is your friend (for once). Check out AsusWRT Merlin. AsusWRT (the Asus OS run by some but not all Asus routers) does have an OpenVPN client built in (and Merlin enhances it), and it shouldn't be hard to set it up to connect to an Air server.