Small Business upgrading to Spectrum

I've got a small business (like 10-15 computers) that is upgrading to Spectrum Business Internet (30-40mb) from ATT DSL. ATT had provided a wireless modem/router that was handling all their DHCP as well. I'm guessing I'll have to order them a cheap router and/or switch. What's a low-end business class router that I could use. Sorry, I rarely handle stuff like this, outside of work (K12) and I know I could order them a Palo Alto and Cisco switch, or just put in a Cisco switch with a layer3 license, but I don't think that would be cost-effective. I'm sure most people use more internet at home in a night than this company uses in a week. I guess a router with a built-in firewall would be nice.