Either PeakD or Ecency would do for posting them and I don't think you would need to use a specific tag for them. But you would need to select either one of those communities prior to posting.

As far as who to approach, when you're on the pc or laptop you can see some community info you can see a list of people, so maybe reaching out to one of them could work.

I haven't yet, but I'm going to. I saw this one and just thought I'd offer that suggestion to potentially get some more eyes on them.

!LUV