Multiple Domain on One Hosting?

Newbie here,

Long story short, I am planning to build a network of blogs (domains), is it recommended to use different hosting (e.g. Bluehost) for all my domains or use different hosting for each domain?

Also, (prob a stupid question), if I use different proxies to update/work on different domains (but the same hosting) will it be detected and penalized by google?

-Thanks in advance!