Hello,
In the attachments I have a PC behind three Mikrotiks and I want this PC to reach what is behind MIK-1 and Mik-2
So my question do I need a switch or I can configure VRRP between MIK-1 and MIK-2 and use MIK-3 as a switch ?
Best Regards,

Hello,
In the attachments I have a PC behind three Mikrotiks and I want this PC to reach what is behind MIK-1 and Mik-2
So my question do I need a switch or I can configure VRRP between MIK-1 and MIK-2 and use MIK-3 as a switch ?
Best Regards,

See here https://wiki.mikrotik.com/wiki/Manual:VRRP-examples
You can use MikroTik 3 as a switch.