@garykz There is a slight hope that this may work...as the Omada routers are traditionally pure-NAT without traditional routing.

If you have upgraded your ER7206 to v1.2.3 (not sure if the Beta of the same name has all the same features)...so see the Release Notes here

https://static.tp-link.com/upload/firmware/2022/202211/20221110/ER7206(UN)_v1_1.2.3%20Build%2020221104%20Release%20Note.pdf

It includes a 1:1 NAT feature, which you may be able to use to link your assigned static IP's across the NAT and map to local private IP's, it should basically create a 1:1 mapping between a public IP and private IP with full DMZ between.  The one thing I don't know is if you can do that with the Controller for IPs not part of the WAN subnet(s).  I'm pretty sure this will get ugly and not work though.  You may have to put a 'dumb' router between your modem and your ER7206 to do the initial routing, and then map Physical WAN ports on the 7206 to individual IP's....  Hopefully it doesn't get that ugly

  @garykz I think for this to work you're going to have to change the subnet mask for your WAN1 to be a /19

So WAN

xx.87.229.121

255.255.224.0

Now your assigned IP's at  xx.87.251.126/29 will fit inside the greater /19 and the 1:1 NAT *may actually* work.