First, today you always buy vSphere 7. Robo exists in 3 different editions
1. Robo Std. which is similar to vSphere ESXi Std.
2. Robo Adv. which is similar to vSphere ESXi E+
3. Robo Enterprise. ... i see it adds "DRS and VM Encrption"?
Iam unable to locate an edition comparison :smileysad:
Keep in mind that you need a vCenter Foundation (max. 4 Hosts) or vCenter Std. ("unlimited").
You should consider a Essentials Plus rather than a Robo if this is your inital setup.
Regards,
Joerg