Refinance when done.I'd recommend a 24 month product, because the renovation & sale or refinance can take so much more time than you think. 

Having removed them from my person name but still personally guaranteed by myself, could I buy 4 additional properties under FNMA investment property product?

Three is so much information about this product in this form. 

Worked with Liberty Bank (local bank) who had this loan product was key for this deal.

Life happens and the unexpected can happen.Watch out for salespeople that are looking to put you into a product that you may not need/want. 100%+ of first year premiums are paid out on commissions to agents.

Those products will most likely have higher interest rates. 

That represents an increase of 10.3 percent;-Total dollar volume for full-year 2021 rose 28.2 percent to a record-setting $40 billion;-December single-family home sales declined 4.5 percent year-over-year with 9,272 units sold;-Total December property sales fell 1.9 percent to 11,432 units;-Total dollar volume for December rose 12.4 percent to $4.3 billion;-At $319,000, the single-family home median price rose 17.2 percent to an all-time high;-The single-family home average price climbed 13.5 percent to the second highest in history, $392,449;-Single-family homes months of inventory narrowed to a 1.4-months supply;-Townhome/condominium sales ended a strong year with a 21.5 percent year-over-year jump in volume, the average price up 13.8 percent to $258,139 and the median price up 20.9 percent to $220,000;-Leases of single-family homes rose 5.9 percent with average rent up 7.5 percent to $2,042;-Leases of townhomes/condominiums fell 23.0 percent with average rent up 5.5 percent to $1,731.

This site is great if you are looking to invest into real estate.Discounts on some products and services are offered to BP members: https://www.biggerpockets.com/perks/proIf you haven’t been to it already, you might want to check out the BP blog: https://www.biggerpockets.com/blog/

We have followed the BRRRR method throughout, and always refi'd into the 30-year FNMA/FHLMC backed products; always in separate names to allow my wife and me to maximize that cheap money (you can each do 10 loans). 

Every market and product type has a market cap rate.