Ralph was already known to have installed keyloggers and the like, blocking Josh Moom's website at the router, and record every interaction well before he goes to Mehico. Notice how he's tried to physically distance every woman from her family as soon as they were in a relationship. Amanda to Mexico. Faith to his wing of the house in a Virginia. Nora was a bit more fortunate because Ralph complicated her move to the US when he swung at the female cop. Hell, I know Ade visited him in Virginia and Ralph definitely tried to woo her to move from Michigan or w/e.
Fun note: if you listen to old MATI streams, Null talks about Ralph showing his vast savings of 50k to Ade. For whatever reason, Null seemed to believe Ralph owned his house (LOL) and was going to be able to coast off that 50k until he died. 50K isn't that much and it definitely didn't turn out like that.