well using mulitsite is just easy and a smart way of building up a blog network.
as for the hosting i would just keep at one host and make sure it is a stable host. Having your own root access helps, being able to do your own reboots etc is also key. You will notice that you will not experience much or any down time. Often down time is caused by resource issues or script failures caused by mysql. A reboot helps in the short period after which you can have an agent look at tweaking your setting for example.
If you are looking for wp-multisite hosting, we have pre-configured wordpress multisite server that you can spin up in a minute. contact me if you would like to have a month for free to try it out.
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