Before leaving the house, Hector made sure to talk to all of the guards and their leader to shoot everyone and everthing that came toward the house, even if it's a fucking dog, which they very much understood, and then the thing Hector waited for finally arrived.
He talked on the phone with the guy who was responsible for the estate security and made some changes to it. Basically, all these guards here only lacked one crucial thing in Hector's mind, firepower.
Most of them had ARs in their hands, and some SMGs and shotguns, but what was the missing key element for Hector was something that gave more firepower and more bullets, and that was exactly the machine guns.
