For a company with 12 computers on a network, it would be advisable to choose a MikroTik device that offers adequate performance to handle multiple connections and simultaneous services, such as VPN, firewall, and quality of service (QoS).

Here are some options that might be suitable:

MikroTik hEX S (RB760iGS)

This is a small but powerful router with five Gigabit Ethernet ports, an SFP port, and support for PoE. It is capable of advanced routing, VPN management and has firewall capabilities. It is a profitable option for small businesses.

MikroTik Cloud Router Switch CRS328-24P-4S+RM

This device is ideal for networks that need many Ethernet ports. It has 24 Gigabit PoE Ethernet ports and four SFP+ ports for high-speed uplinks or network storage connections. This model also includes switch and router capabilities, which is useful for managing internal and external network traffic.

MikroTik Cloud Core Router CCR1009-7G-1C-1S+

For companies that require greater processing capacity and handling of multiple advanced connections, this router offers 7 Gigabit Ethernet ports, 1 combo port (Ethernet/SFP) and 1 SFP+ port, with a powerful 9-core processor. It is ideal for applications that consume a lot of bandwidth and require high network performance.

The choice between these models will depend on the specific needs of the company, including the size of the network, the type of traffic, and the additional network services required. If Wi-Fi support is needed, you can also consider adding MikroTik access points to any of these routers to provide Wi-Fi coverage for the business.