Mine is tossed from the end of the dock see attachment.
Removing the weeds is a dirty job since I have muck around the lake, no sandy bottom just muck and bog. To remove the weeds I pull most off by hand until I can lift it, then I shake the rest off. It will pull up about 75-100lbs at a time. In half hour I can clear a section 15' wide by 30' long down to the mud. If I had a helper it would go twice as fast. It will even pull out lilly pad roots too, but there's enough left that the lilys still grow.
I've lived on this lake before the milfoil took over, the mucky edges used to be filled with fish beds. As a second benefit after a raking I noticed the fish quickly move in and create their dished beds in the mud, so I like that too.
It looks like your weeds are milfoil too, if they are then it should work fine. I wouldn't think my rake would work well on the tall sparse sea weeds.
The rake rendering is after three modifications. My first generation had the rope tied to the outside ends to save weight, but that started to fold in half so I added the bent strap to pull on. That too started to bend in half, then I added the inside reinforcements. It's been working just fine since.