Looking for a router and switch combination product with 4/5G failover

Hi,

We have an existing managed network with a router providing DHCP and WiFi. Currently I am running a small 8 port switch off that and need to add more wired devices. I would also like to implement 4G / 5G failover for one wired device and some QoS rules to priortise traffic from this device so I was thinking of putting a router in front of the managed router, and then creating a new subnet and providing WiFi from this router instead, as well as adding a switch with additional ports. I could then ask the company providing the managed router to turn off the WiFi on their router.

Does this sound like a reasonable way of doing things?

Is it too much to ask one product to do all of this? The only one I have found that looks suitable is the Mikrotik CRS125-24G-1S-2HnD-IN

This has a micro USB socket, which I assume could be configured to use a USB 4G dongle with a micro USB to female USB type A cable?

I have some experience with RouterOS and it seems that QoS and failover are both supported.

I also want to mount the router/switch in a metal rack cabinet, so I am thinking of getting extension cables for the wireless antennas so that they can be placed outside the rack. Are there any issues with doing it this way?

Any advice appreciated