I sure as fuck ain't doing this personally but I do want to watch.
Well, since they're security guards for THAT shit, you DEFINITELY need plenty of spoopy planned. Make sure the players know from the outset they can and WILL die a few times. Give a high PC turnover rate. Also, study the large amounts of lore of these games so you're absolutely, positively sure on how these dumb spooky robots work on an 'individual' basis. Like, which ones are you wanting in this one? Are you going to make your own to spice things up a little? If so, make 100% sure they fit in decently enough for minimum bullshit.
Also, get a good feel of the layout of the place, I'd make a simple map somehow. I'm pretty sure there's stuff for that online, search up 'RP House layout generator' or something, or just use MS paint, pretty sure everyone here is chill enough to not give a shit. Also, will the security guards have to do crap like, "Ah crap soccermom #381 accidentally left one of her kids...B-BUT OUR ANIMATRONICS ARE STILL OPERATING. OH SHIT!"? That'd ramp up the panic and add some awesome 'Oh crap I have no idea what's going to happen next!'.
In any case, good luck with this! Do tell what you're going to name it and where you're going to place it, I'm going to provide snarky commentary. If that's okay with you, anyway.