you need to give more information, there are too many possible uses and configurations with what you disclosed. Being in a multicompany building, is this a distribution by the building owner, or is this a direct connection from an ISP (mica-ip.nl ?)
Just 4 servers to connect with an external IP address? Nothing else? No local client devices ?? You have only one extra public IP address.for a fifth device.
If only 4 servers are to be connected and it is an open connection (Protection is in the RB3011) you could just bridge everything to one bridge at that's it. (You reduced the RB2011 to a switch)
But it would surprise me if this could be the solution you need. !!!
Just guessing what your needs are, here is a possible scenario ....
You probably need a WAN type connection on ether1 , with protection for incoming requests from that side. That means ether1 is on the default "interface list" named WAN, having a fixed IP address or DHCP client, masqerading all outgoing traffic in the NAT rules of the firewall, and is a firewall protected interface.
Ether2-5 are bridged to one bridge. That bridge has a DHCP server and is in the default LAN "interface list". It runs it's own subnet private network. Servers get reserved or fixed ip adresses in that local range. Default route is towards 22.214.171.124 in IP routing.
Local client devices and servers use local IP adresses in this setup. (To be able to have more than 1 client device)
The bridge to ether1 traffic needs dedicated NAT rules for the servers in the firewall NAT section, so that on ether1 they have the public IP adresses you named.
You may need firewall rules to forward ether1 incoming requests to the servers. Only open the ports that you want to be public.
DNS setup on RB2011 will normally use local addresses for the servers, and forward other requests to the ISP DNS servers.
If you need to contact your servers with their public IP address from the local network, you will need to set up hair-pin NAT in the RB2011. (https://wiki.mikrotik.com/wiki/Hairpin_NAT