That is good news!
I would like to ask the first question

Regarding secure nodes, how many can one person operate? Is it best if it is limited to one secure node per person?
You probably will be much more interested in creating this system on VPS, here some instructions and calculations how this can be done. This is just preparation, secure nodes are still not ready!
https://blockoperations.com/build-zencash-secure-node-part-1-prepare-vps/