I updated my eagle library "WIZnet" for the mini io modules.
Maybe this part & footprint "W...IO-MINI" in the eagle library could be helpfull for others as well.
Attached a screenshot of my footprint:

I will upload all my creations in my account @ 4jochen - feel free to copy whatever is helpfull for you - no copy right.
By the way you use two very different product names for this modules.
e.g. W5500-io vs. WIZ550io-mini
Please avoide user confusion - please use one consitant naming.