How to set up secure permissions: Multiple Users & Websites / Apache / www-data

I had my own private VPS that my hosting service managed
and now I am switching to a cloud server where I have to manage everything myself. I am
trying to mimic their secure setup that they had. On my old & new server, I have my
users/websites set up like those listed below. My Apache Virtual Hosts have these as the
DocumentRoot, so they are running right
now:

/home/user1/site1.com
/home/user1/site2.com

/home/user2/site3.com


/home/user3/site4.com
.....

Basically
on my old VPS, the Apache web server could run all of these sites, and at the
same time, each user did not have access to the other user's files (in case
one site got hacked, the hacker couldn't access the rest of the sites). I noticed that
directories had 755 and files 644
permissions.

The way I set up now, everything in
these user directories are in the www-data group, the directories have 775 and files 664
permissions. Files from one user's website are accessible from another user's website
(not good).

How do I set up the permissions to
mimic my old VPS described
above?

EDIT:
After
further studying, I should note that I set my server up to run http/2. I found that
Apache MPM-ITK is actually required for separating vhosts based on user/group. However,
Apache MPM-ITK is not compatible with http/2. I'm not sure what else to do except
abandon http/2 in order to get the mpm-itk mod?

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