The quoted numbers came from a CHIRP bulletin, maybe 3 or 4 years old now. They are SPECIFICALLY for aircrew, so if you are not, don't bother to avoid disappointment.
All extremely public domain by now. And a few are incorrect
As for arranging visits, I am happy to 'administer' something for those ATCOs who want to, and are able, to arrange what are essentially private visits for 'wannabees'.
Let me know your unit (by PM) and when someone requests a vist to that specific unit, I am happy to put them in touch with you.