I got approved in cambodia with 4 month statement but the 500k was only there for about 1 month. Before that the balance was between 100k to 400k. Never got any questions about it.
From my understanding, if those rental properties are owned by a company of which you are the owner or the director then yes but if you yourself own the properties in your name but without company then no.
I've seen people in this group being accepted with multiple accounts and a coverletter explaining their situation. Do a search and you'll find their stories for sure.
However, the money does need to liquid so it can't be locked up in a fund.