It is because the AdBlocker detects the affiliate code and links and they block it. The best solution is to create the CB white label and then send the visitors to it rather than the sponsor directly.
I think that you should go with the CBBMU as you can pull lots of models from different cam sites on it and it is easier to run for newcomers.
For the Robo, technically you could start with the low end shared hosting plan, if you are just starting out and you do not have any traffic, but the VPS with 2 core and 2 GB of memory would be a wise choice but you can upgrade to it after you exceed the resources.