I think you're getting the wrong end of the stick here.
The hosting co you sign up for is not on your computer but on their own. You sign up for one, or two, suitable companies and then once your webspace has been alloted to you, domain name bought and activated then you upload your site files to it via FTP.
I have three websites all hosted by Easily at cost of £200 pa and I think you may find it a bit expensive to sign up for multiple hosts anyway.
This question should really be in the web design forum.