Realistically, I will be living in CA for the next ~5years; however, I'm not married to the area I'm currently living. 

If you owner occupy and rehab the home around you great while looking to sell at the 2 year and a day mark or later (to wash up to 250K as a single owner occupied/500K if married).  

The other option would be if there is a possibility for you to sell your primary residence and every two years move to one of the property and gradually sell each property once you get that tax exempt which is $250 thousand if single or $500 thousand is married.

I graduated back in May of 2022 and I am currently living with my beautiful fiancé and we are getting married in October.

I'm on my 3rd one right now (41, married, and 2 kids  - just trying to remove that excuse). 

So if you have 10 and you are married....then your spouse can have 10 as well. 

It sometimes isn't as smooth once you are married or have kids if you dont want to have a shared space with family around. 

A married couple in their 70s that have previously owned homes for 40+ years and are now retired with no debt, no kids, and 50 years experiene as adults should not be looked at the same as a boyfriend/girlfriend in their early 20s that have never owned a home or rented together before, still paying student loans, living paycheck to paycheck, and financing that 2018 Dodge Charger in the driveway.

Let's say 3 young single guys want to buy investment triplex.  5 years later your credit is all tied up in that triplex so when one of your partners gets married and has kids and his wife wants to buy a house for the family, they can't do it, because his name is on that investment mortgage. 

There are limits to how many Fannie Mae (personal) loans you can have, which is 10 per person… so if you are married my first suggestion is to buy your properties in one person’s name to maximize  how many loans you can have.