Bottom fishing is more commonly practiced than float fishing in the tidal portion (or also the non-tidal main stem) of the Fraser River because you are targeting salmon that are constantly moving. In a stream where runs and riffles are more defined, you can constantly drift your float and bait over fish which are holding at or moving into a particular spot. Fish use the Fraser River as a corridor to travel through to their natal streams, so they are constantly moving. By anchoring your bait on the bottom and letting scent travelling with the current, your goal is to intercept these moving fish by placing your bait at an ideal location and at an ideal time. If you are float fishing, your bait will be carried around by the current and you will need to constantly retrieve and recast. Your likelihood of intercepting a fish is a lot smaller when both your bait and your target fish are always moving. You also have to deal with keeping your bait near the bottom and the unknown depth of the murky Fraser makes that rather challenging. Lastly, because the frequency of bites is a lot lower than what you would experience in a stream, it doesn't seem worth it when you need to rebait often from casting and retrieving.
The problem with having a V stick as a rod holder is that the angle of the rod is not great. Ideally, your rod should be pointing slightly to the sky at the waist level so you can strike easily when there is a bite. Somebody should design a foldable rod holder, mass produce it, it'd go out of the stores like hot cakes.
I have float fished at times with roe in the tidal portion of the Fraser River and had some success in the past with trout, char and jacks. When the tide peaks and current is almost absent, that can be a better alternative. By allowing your bait to slowly drifting around, you just might have more success than anchored bait because scent is not being carried around as much due to the lack of current at high tide.
Try it and let us know how it goes. Good luck.