I have liked all the SLR handguards I have.
The Intrepid has a full length at the top and bottom. Only thing mounted on the bottom is the bipod, nothing on top. The bottom resting on certain surfaces without rail covers may be an issue as any bottom rail would possibly be. The Solo has full length on top, but only segments that are part of the handguard (not mounted by KeyMod or MLok) at the bottom and sides at the front/muzzle end of the handguard. The shape is smooth and comfortable and would work well in most situations. The Imtrepid is on my 6.5 Creedmoor and the Solo is on my 6 Creedmoor. Both extend past the gas blocks.
I liked them enough that I bought an Ion for another build. This is top rail only with a segment mounted on the bottom of the front/muzzle end by keymod in my case. Something other than a bipod will go there, if not I'll remove it. It's going on a 458.
All are well made. The Ion is pretty light.
I have a Seekins SP3R V3 on my Grendel. It's real nice and the flat bottom works well. Bipod is mounted by a rail segment attached. Everything on all have been rock solid. It extends past the gas block.
I also went with SLR adjustable gas blocks. They've worked very well, I just clean them well every now and then. These are the only adjustable gas blocks I've used so I can't provide info on any others. SLR's have worked so well, I've never thought of replacing them. The 6.5 C is .936 with the 6 C being .875. 6.5 I have a Rainier Ultramatch barrel and the 6 C is a Wilson Combat Match barrel. Both are very accurate, the Wilson is a fast barrel. The Grendel uses a standard non-adjustable gas block on a Satern barrel that has worked very well. I have a Wilson Combat adjustable gas block that I bought for another project, but decided it doesn't need adjustability. It's sitting new in its box and is one that uses a straight gas tube.
Seekins or SLR wouldn't be bad choices. I've tried or run a bunch of other handguards, but these are the ones that fit and worked for me.