Difference in routers for a home and small business

My friend works at a bike shop and they have modem/router/wifi combo that they are renting from the isp and they have asked me to recommend a router that they could replace it with.

Is there any reason that they couldn't use a consumer router or an edgerouter? They have 5/6 computers and they have one of those big on the wall voicemail systems but I'm not entirely sure how those work so I don't know if consumer routers would support that type of thing. They also have a security camera system but I'm pretty sure that those don't need anything special.

I was going to recommend an edgerouter and come set it up for them but I'm not super confident about being able to set up the firewall correctly so that they aren't vulnerable to anything. Is there any difference between a firewall that is used in a home network and one they would use at a small business like a bike shop?