Hello,
I don't know why your E-mail is blocked. I will duplicate this answer from my personal E-mail (Gmail). Please send your question on this mail in this case.
The size of your projects (number of controllers, tags) depends on the power of your PC. Some of our clients use up to 20 PLC without problems in their projects.
A well designed project with 2000 tags worked without problems on single board computers like Raspberry PI with 2GB of RAM. Some of our clients developed projects with up to 10000 tags on the more powerful PC.
Price list and licenses structure I will send you by E-mail.
Best regards,
Ruslan