I would recommend that you set up your device and do a wireless survey of the site to see if it provides the coverage you desire. The coverage from the MX-W devices is okay, but not as great as the MRs. The MX-W devices are only Wifi5, and you can’t really move the MX to the ‘ideal position to achieve the best coverage’, more often you are stuck with where the WAN service is delivered and other Ethernet cables connect to the MX. If you’re only talking a handful of users and the site is unlikely to grow then the MX-W may be the go, but I’d seriously consider a non-W MX with an MR, and a small PoE switch if you need it (or the MX68 which has two PoE ports).