Does this particular product come with the keeper plate (the picture doesn't show it)?

I am not sure if this will answer your question.... If by keeper plate you are referring to the plate that gets screwed into the top track so the bar from the lock goes into it, then yes it does come with that yes you are correct it does not show that in the picture. The top plate has a slant to it so that when you go to close the door it slides up the slant then the bar from the lock automatically slides over the plate and into the hole. This was a little hard to install, just took a little more effort than I had thought that it would. It is hard to see up into the track and drill the pilot holes for the the top bracket (Keeper Plate ?). BUT now that I have it installed it works great! I have them installed on two sliding doors and it is so much better than anything else that I have tried. I have had these installed since April of 2014 and have had no problems with them at all. Hope this helps.

is this spring loaded ?

Yes this is spring loaded. You can turn the lock a quarter turn to keep in in the unlocked position if desired. If not set at a quarter turn the spring will automatically lock when the door us put back in the closed position.

Can I install this to the bottom track? My Patio doors are tall and I would not be able to reach the top.

I would have to say no, you can't install it on the bottom due to the door track being in the way. Plus, when installed the bolt receiver needs to have clearance which it has on the top. Since the bolt is spring loaded though, you could always attach a short string/rope to it so you could pull it down while you open the door.

How is this device installed, specifically? How many holes would Need to be drilled to keep it secured?

Hello Jennifer, I drilled four holes into the operational panel to secure lock and 1 larger hole in top of slider track to accommodate locking pin.I would be happy to send a picture if you need further assistance.I installed this on an Anderson slider. Sliding patio doors have slight variations.

Target Species	Dog
Unit Count	1.0 Count
Age Range (Description)	Baby
Closure Type	latch
Manufacturer	Cardinal Gates
UPC	635035301053
Global Trade Identification Number	00635035301053
Product Dimensions	2 x 4.5 x 7.5 inches
Item model number	PDG01-W
Is Discontinued By Manufacturer	No
Number Of Items	1
Batteries required	No
Dishwasher safe	No
Is portable	No
Item Weight	9.3 ounces

Cardinal Gates Patio Door Guardian, White

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