Neither of those two listed fill me with confidence.
Don't be too hung up on location either. I recently bought an L bracket from a UK supplier - based in Southsea, or so the eBay ad said. It came all the way from China.
The first holds a lot of stock for someone with only 22 feedbacks.
The second is nominally in France. So what about warranty? Both seem to be third party cover and not manufacturers.
I wouldn't buy from them, but as ever caveat emptor. My own view is that it is better to spend an extra £100 or so rather than lose £1,000.
Panamoz/Digital Rev/HDEW might give a more reassuring transaction.