Acrobat Pro DC multiple computer installation

Thank you for this (now old!) answer. A natural follow-on: how do I purchase additional licenses for my user ID?

I work in multiple different offices, and prefer desktop computers. Therefore, rather than tote a laptop around, I have setup desks with Surface Studio machines at all my regular workplaces. I have 7 of these setups across multiple countries, and all the other cloud software I use works just fine in this arrangement (e.g. Office 365). I also do have a couple of laptop/tablet machines I use now and then, plus of course iPad's and iPhones. To be clear, I am the only person who uses any of these machines, so it will be rare that more than one will be in use at a time (it is conceivable that I will have a Studio and a laptop open on the same desk at the same time, but pretty rarely). 

I understand that your terms allow for only two installations, which is disappointing but understood. Here's my question: how do I give you money to increase this number? I don't want to have to create a different Adobe ID for every two machines I use, because I want things like my digital signature and whatnot to sync correctly. So, how do I buy additional licenses and add them on to my Adobe ID? 

the license is for one person, two computers. Two people need two licenses. If you want more you must either get volume licenses Or use different Adobe IDs. Do not try to add more licenses to one Adobe ID, they will be lost.