Sony A7RII L Plate/Bracket for Battery Grip

I just got myself a new tripod, the Benro Travel Angel 9X Carbon Fiber, and a new ball head, the Sirui K-20X. The ballhead comes with an arca swiss style QR, and a plate. But I also have a battery grip for my Sony A7RII, so I would like to pick up an L bracket for that, and I can use the plate that comes with the ballhead when I don't have the battery pack on, or on my old Canon 40D if need be. I got the Neewer replacement for the VG-C2EM grip, so I am assuming that anything which would fit the standard Sony grip will fit mine.

I've done a little bit of research, but only have found two options so far. The Really Right Stuff L Plate for the Sony VG-C2EM, which costs almost $200. The ProMediaGear L plate is $40 dollars cheaper at $150.

From my research I found this issue with the RSS:

www.fredmiranda.com/fo​rum/topic/1398731 wrote:
="http://www.fredmiran​da.com/forum/topic/139​8731"]I've tried the video cable clamp and it will not fit, one fork of the plate hits one half of the threaded cable clamp post.

I'm curious if anyone here has any experience with either of these plates, or knows of other options, especially if they are less expensive. Or any advice in general in making this decision. Is the RSS plate worth the extra $40? It seems to be machined out of one piece of metal, while the ProMediaGear has that extendable part to give space off the side of the camera. I guess the RSS gets that space by adjusting where the bottom of the plate attaches to the battery grip? Also, why exactly do you want to have that gap between the camera and the plate on the side?

Thanks for any help in this decision.

PS - The legs arrived today, and the ballhead arrives on Friday. So I haven't been able to use them yet, but just setting it up and playing with it I really like it. The Benro is only 2.67 pounds, The center stem can be inverted to mount the camera below the legs, it comes with a short center stem too which can be used if you want to spread the legs out wide and get really low to the ground. The leg with the foam handle is detachable and you can put either center stem on it to make a monopod, it also comes with a wooden handle and wrist strap to use it as a walking stick, if you're into that. It comes with a set of spiked feet to replace the rubber feat to use outdoors. The padded bag is nice too. And naturally it has a spring loaded hook on the bottom of the center column for adding weight to increase the stability. The only thing is that angling the legs is a bit stiff, but it comes with an allen wrench to adjust that. I suppose after using it for awhile I should write a proper review.

I also just discovered this very unique RSS L bracket... it's for the Metabones Adapter for Canon EF to Sony NEX. But the Sony A7RII uses the E mount, right? Are NEX and E mounts the same thing? Would this work on my Metabones adapter which is this one: http://www.adorama.com​/mbefebt4a.html