Just checking, better be safe than sorry

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I just got a new baby car seat (yeah, yeah my little monster has almost outgrown the Graco SnugRide seat) and should be installed rear facing. The question is: Apart from the back seat tethers, Does the MZ5 have any of those on the floor? The MZ5 manual says nothing plus I have not seen any. I'm all set with the normal latches (same thing as the old seat).
- No the Mazda does not have the tether on the floor, that manual mentions it is for Europe.
The new seat is a Britax Marathon. Its manual shows the floor tether as the first option. As a 2nd option it shows the tether strap crossing overhead to get to the back seat tether. Of course option 1 looks/feels better but I don't care as long as its safe.
- Transport Canada have tested this seat without using the tether for rear facing, and it has passed.so right now the 2nd option is just that optional if you like to install it that way. I find it very difficult to put the child in the seat iwith the second option.
Oh, me likes the colors. Black n gray matching the car seats