@Lando also — and I hate to recommend these without experience with them — there are some newer HOME systems that use a separate band/frequency to build a “mesh” (really it’s just a background network) between multiple access points and then those service users without need for wires...
But they’re just as spendy as what I would deem “business class” and have bandwidth limitations between the devices.
If you had to have something “up and running tomorrow” they’re maybe an option, but you’d plan to replace them with business class APs managed correctly in the “nearish” future. Easier initial setup, problematic down the road. Google makes one and there’s some others, but my gut feel from reading about them is they’re not stable enough for a business environment.
That said, they’d work in a pinch.
Technically even a few old Apple Airports used would do that as well with their “extend a wireless network” feature. They’ve killed their WiFi product division and there’s no sign they want to be in that business anymore, but the old units do that fine, if not somewhat slow.
Ten users and 100Mb though? They’d work. The old tiny units would be very unobtrusive sitting on desks in a corner also.
This assumes you have a Mac to manage them with the Airport Utility.
They also have almost zero options to do any sort of VLAN support or advanced networking but I doubt you need it for ten users.
So there’s some other options. I just hesitate to tell a business to use them but for your size one of these little “mesh” systems might do just fine.
It’s essentially what you’d be doing with one of those routers you mentioned — putting them in bridging mode and having them bridge back to a central unit — but the Apple and newer systems do all the config for you.
Whether they’d need reboots or have other problems with speed regularly, I can’t say. I have a three node Airport setup at home mostly because we have crap internet anyway (10Mb / 2Mb) in our rural location so WiFi speed never taxes anything and everything going to the Internet is slow. Ha. It just sits here and runs and covers the whole house.
One bigger older Airport unit in the corner office where the microwave system Ethernet comes in from the roof, and then two of their tiny Airport units, one upstairs and one downstairs, extending that network. Setup is brain dead simple for those.