Microtik: 5 internal subnets (tenants) + 5 "white" external addresses (one subnet with a single gateway)?

Question

Mikrotik

Cry from the heart! The essence of the question is as follows:
Router Microtik RB2011
There are five subnets (tenants) - each with its own pool of "gray" addresses. DHCP and DNS for them lives on Microtik.
There is a pool of "white" addresses (subnet) allocated by the Provider ... i.e. the entire "white" subnet goes through one Provider's gateway (the gateway itself belongs to the same subnet ...)
The router is managed / configured via the SFP
interface address!
I've already broken my head - nothing works (so far there was no experience in setting up such configurations for Microtik) ...
All Ethernet interfaces have the necessary addresses, DHCP, DNS are configured ... i.e. "gray"
are issued, DNS names are resolved...
If you specify only one public interface, everything rises with a half-kick! But the task is precisely that you need to use 5 white addresses ...
I've already rummaged through everything in the direction of PBR, and srcnat, etc. etc. I already painted the traffic with a mangle ... or painted it wrong and not there ... :(
Can someone tell me or show at least in the enlarged blocks the settings config ... I'm not interested in theoretical links, but in a working config ...

Answer 1

I have 2011 configured, if I'm not confused, in a similar way. 3 white IPs, 3 isolated subnets, NAT, DHCP, WiFi...
It wasn't me who set it up, I gave TK. If you are interested in joining the artist - write to Mail.

Answer 2

I have white IP - from the same subnet! (one provider)... all these whitelisted IPs go through the same gateway (belonging to the same subnet!).