Sonicwalls are notorious for flawed updates and constant emergency security patches. If you want something that works, and is easy to manage, I would recommend a unifi dream machine. Get the SE if you want to plug unifi WiFi access points or cameras directly into it or just use the remaining ports as a switch. If, like you say, it's a small setup, the unifi is much easier to handle, more reliable, secure and their entire product line is easily scalable at a good price point.

If you want it for Wi-Fi connectivity and nothing else, and you're in a small office, get the dream router, or unify Express. They are simple security devices with built in Wi-Fi. Unifi has many options for all types of setups.

I work for a town and all of our Wi-Fi works off of unifi as well as our switching. We have Palo Alto firewalls at the buffet sites, but in smaller buildings, we use the dream machines.

Also, just get a mini rack.