PSA: I recently found out that my credit union offers personalization of your debit and credit cards. It's a free service for the accounts you have at the bank/credit union. I have made each of my rental properties a photo card so I can quickly and easily remember what card goes to what property.
I don't personally have any properties at the moment. However, I am a bookkeeper for a REI and QBO ProAdvisor. I still encourage clients to keep things separate and streamlined but that's just me...