Much depends on the actual service you have.
Most of Zyxel routers they supply appear to be VDSL but I doubt you can get 500Mbps over VDSL.. so I assume you have optical fibre into your house and a Fibre ONT (NCD all sorts of names.. but basically a box that has fibre in and ethernet out).
What is the exact model number of the Zyxel?
5g speeds.. again I am a bit confused. Apple routers will not support 5G (i.e. the next internet service after 3G and 4G)
Apple router can support 5ghz wifi if that is what you mean.. but that is LAN only.. no internet.
Your Apple router must plug into some ethernet device.. modem ONT whatever. Nothing else can work.
Apple routers are NOT capable of 500Mbps throughput over IPv4 .. Max would be around 450Mbps. And for 5ghz to give you full internet speed you would have to have the device right up close to the Apple router and working at full sync speed.. and be very very lucky. Apple routers are now 7year old design.. were never expected to throughput this speed.
IPv6 is different.. no NAT is used.. so if you are given a pure IPv6 setup it might work but only over ethernet.
Bell are famous for blocking other equipment.
See https://brashear.me/blog/2015/09/23/how-to-use-cincinnati-bell-fioptics-with-your-own-router/
Apple routers CANNOT spoof MAC address. So it is more than likely impossible.
You need Asus or other high end router.
