We just got the black 3DMaxPiders, you can get them from amazon as a two piece order (front set and back set) in black... although I think when I ordered the there may have only been a couple in stock. We just got them last night.
As for the Canadian OEM premium versus the 3DMaxPiders, it was an easy decision in my case. My wife did not like the over the top heavy patterning and large logo-ing on the Canadian OEMs at all. She much preferred the lower key look of the 3DMax, and after installing them, I have to agree that I think it works better with the Sigs clean minimal line interior. I know thats just personal preference. She is thrilled with them though.
I can post a pic when its done.
And as to the other question, we also got the 3DMAX cargo liner, and this is also very nice. There are specific cut out areas that you can cut to expose the other set of tiedowns on the cargo floor towards the seat backs. There are relief pockets molded in within the cutout area, so it should be straightforward to follow the outline with an exacto. We do have the floor mount cargo net installed, so I will be cutting them out.
I didn't cut them out yet as I didnt have time last night, so I can't comment on that yet. The other two tiedown brackets are installed on the rear wall (on either side of liftgate), and cargo line has depression reliefs in the lip of the liner in each spot, so no cutting required here.