Hello. I would like to get your inputs on this. 

I have an existing mesh wifi using Deco E4, 1 downstairs and 2 upstairs. I plan to buy a router that would able me to plug in a USB drive to act as a NAS. It will be situated downstairs and I will run a ethernet backhaul to the Deco E4 that I will move from downstairs now to upstairs. Any idea which router model would be compatible with the Deco E4 at the same time ensuring that it will not act as a bottleneck on the network?

Thanks for the help.