ANSI/ESD S20.20 does not have any of those requirements except resistance measurements. There are many floor specifications that can meet your needs. What kind of floor are you looking for? Is is epoxy, vynil or some other type of floor.
You may want to consult the buyers guide on the ESD Association web site to see some suppliers and contact them.
Often the fitters are normal floor fitters, so often don’t know about ESD requirements! They need to follow all manufacturer’s instructions on laying them, make sure they know that they should be using in-date conductive adhesive, that the floor tiles have to acclimatise in the room they are to be fitted, and that yes ground points are required (I have heard all the excuses!). Once laid make sure that they are cleaned before testing, but only after sufficient time to allow the adhesive to cure fully. We had issues when it was cleaned a few days early!