The choice of Miktrotik devices is very wide and the selection of the router depends on the quantity of traffic and users you have to manage (we are talking from 100 to thousands of concurrent users).
For a test purpose, it is more than enough even the smallest one.
Our suggestion is:
a) The RB9xx series is ideal for dozens of users
b) The RB2xxx series is ideal for hundreds of users
c) The CCR series is ideal for thousands of users