Most small offices are still paying $10–$15 a month to rent a combined modem-router from their ISP. That box is usually underpowered, can't isolate guest Wi-Fi from POS, and dies the moment you jump to a higher speed tier.

Buy the hardware once. Three rules before you spend a dollar:

1. Don't buy a gateway unless you have to. A standalone DOCSIS 3.1 modem plus your own router gives you control. Combined units are what ISPs rent because they're cheap to support, not because they're good.

1. Match the pipe, not the marketing. If you pay for 1 Gbps, you need multi-gig LAN and a modem actually certified for that tier. "Wi-Fi 6" on the box does not mean it can feed 40 devices on a Friday.

1. Segment the network. Guest Wi-Fi, cameras, and the register should not share a LAN. If the hardware can't VLAN or at least run a guest SSID that cannot see the rest of the office, skip it.

If you rent the ISP unit today, you are financing their hardware with no equity. The blueprint is the 5-minute buyer checklist I use so you pick the right box once.