my opinion: This is a business decision. Pricing exists because markets can be segmented.
For instance, someone will pay $x for candles. Someone else might pay $x+3 for blue candles, or only pay $x-1 for pink candles. You get the picture.
Pricing is a function of value (and cost, and other things too). One presumably gets atleast $x worth of value for an item which costs $x. If you get more value, customers are happy (and you potentially could've made more).
Figure out how much value you are providing, and come up with a number. I don't know how companies arrive at pricing, perhaps, some courses can help, or someone with business background.
So, figure out who you want to sell floating licenses to. Big companies, small companies, academia, industry specific sectors? Is there a "norm" for similar service? If not, be bold and set it high. You can always reduce it. If you set it too low, raising it becomes difficult.
Hopefully, it helps. I read an excellent article a couple of years ago.
It is provided in the accepted answer for How do you decide how much your software will cost? It does a really good job of explaining software pricing.
Some other useful insights...