I could be totally off, but would it be possible to use fast storage such as multiple m.2 SSDs on an addin card like the Apex Storage X21/HighPoint SSD7540/ASRo

I could be totally off, but would it be possible to use fast storage such as multiple m.2 SSDs on an addin card like the Apex Storage X21/HighPoint SSD7540/ASRock Blazing Quad M.2 Card? If latency is of high priority these options might still be lacking compared to RAM.