I have an earlier Saris Bones rack (the link in your post is throwing server errors at this time, so can't tell how different the RS is) and would be astonished if it fails to fit your Golf.
I've used mine to carry a Sprint GT road bike and Giant XTC mountain bike on a '98 Audi A4, '06 Audi A3, '03 Passat and now on my JSW TDI. It fit them all perfectly and even though the straps do pass over the spoiler as you mention (on the A3 and JSW), it has never caused any issues. The bulk of the bikes' weight is on the feet, not pulling on these upper straps.
The rack is very well made, goes on and off rapidly, holds the bikes solidly and is very adjustable. I've tried others and if my Saris ever got stolen I'd buy the same thing again in a flash.
EDIT: Your link still doesn't work, but going in through their main web page I now see the RS. I would save some money and buy the Bones 2-bike (which I have) or 3-bike if you need it. I don't like the look of those steel straps and the whole rig sticks out a bunch more than the 2- or 3-bike with its fabric straps. They are so easy to dismount and throw in the trunk that I wouldn't go for the RS just to get more secure locking, which may not be all that secure anyway.
-dan
I've used mine to carry a Sprint GT road bike and Giant XTC mountain bike on a '98 Audi A4, '06 Audi A3, '03 Passat and now on my JSW TDI. It fit them all perfectly and even though the straps do pass over the spoiler as you mention (on the A3 and JSW), it has never caused any issues. The bulk of the bikes' weight is on the feet, not pulling on these upper straps.
The rack is very well made, goes on and off rapidly, holds the bikes solidly and is very adjustable. I've tried others and if my Saris ever got stolen I'd buy the same thing again in a flash.
EDIT: Your link still doesn't work, but going in through their main web page I now see the RS. I would save some money and buy the Bones 2-bike (which I have) or 3-bike if you need it. I don't like the look of those steel straps and the whole rig sticks out a bunch more than the 2- or 3-bike with its fabric straps. They are so easy to dismount and throw in the trunk that I wouldn't go for the RS just to get more secure locking, which may not be all that secure anyway.
-dan