Simply put: If it isn't rated, I will not/do not trust it. Break testing for your quick links at Home Depot/Lowes, etc. are not up to the same standards as those for rated quick link options. You won't be spending all that much more and what you're truly paying for is peace of mind and predictable gear behavior. The materials used to make rated options are also significantly more superior than the shite that you can buy on the cheap. Besides, if there were ever a situation where you needed to sever that connection, you wouldn't want to have to unscrew two cheap quick links with opposing gates when you could be simply unscrewing one higher quality one. Unscrewing those two links while they are under load would be next to impossible side by side like that. By using one quick link in that rope grab, you will also be improving the movability of the link in the connection hole. It is possible that those two links together might get caught and ratchet against the connection hole of the rope grab, especially if one or both becomes cross loaded. This wouldn't happen with just one quality quick link.
The best small size carabiner with double or triple locking gate is the DMM Perfect-O. I use them all the time. They are phenomenal. You could also use a rated Omega shackle or even a Notch Quickie instead of quick links.
Perfect-O:
Omega Shackle (not the one you want, but it's an example of the type):
Notch Quickie: