Getting A Personal Residence (4 mortgage limit)

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So I'm closing on a third rental. I'm using Heloc for down payment strategy to acquire new rentals and letting renters pay it down. Currently I have one Owner Occ with roommates that I plan on moving out of when the year is up and renting the last room. This lets me look for another primary residence with another Owner Occ loan. I would be covering my primary with my day job.

How important is it that the 4th house should be my Primary?

If I go for a 4th rental, will it be difficult to get a Primary Owner Occ on the 5th?

Am I jeopardizing my chances to get a house for myself to live in??