Yeah, I hate shrubbery. We completely did away with the boxwoods around the house a few years ago. They were planted when the house was built. I never liked 'em. A pain to maintain them and surprisingly hard to kill. Resorted to ripping them out of the ground with my Dodge 4x4 and a tow strap. I'm sure the neighbors got it on video and filed it under "you might be a redneck if"
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We do have rosebushes planted under the windows, but they are not of the size that you could hide behind. Just big enough to aggravate the hell out of someone trying to crawl in the windows. Our windows are also double pane with metal bars between the panes. You'd actually have to raise the window to get in through it, not just break through. Good window locks and wireless contact sensors for the alarm system.
I am a firm opponent of storing chambered shotguns inside the home for 1 simple reason. Shotgun safeties (Mossberg, Remington, doesn't matter) do not render them drop safe. It only blocks the trigger, not the hammer or sear. Combine that with "up high" and it's setting up for a potential tragedy. As it is chambering a round quickly is a software issue that we've worked on. She's more comfortable with the Mossberg setup which is why it stays out when I'm not here. I like Remington's myself, but I've used both enough that they are second nature.
The door knob spinner deals are fairly easy for us as well. We have them on the exterior doors to keep our son from exiting without supervision.