This is the layout I personally like to use and one of the ones I believe the OP mentioned:
https://imgur.com/a/aV8z4cI
(Note, in the back (left), it makes sense to replace where a couple of the "return" from UG belts would be with just regular belts, as I've already done for this example.)
That said, I wonder if it might be easier (or maybe not!) to have it work with a BP of the users choice? IE, they have a tileable BP of their own already and somehow designate it as the one the planner should use, that way people are not restricted to only the options you provide? (Similar in concept with FARL.)
This would also solve the power pole type issue brought up in another thread. Me, personally, I'm using BPs prior to bots for planning. Having something like this would make planning of the ore fields faster.