Plausible deniability requires people to believe that you don't know about any so called "hidden" volumes. That goes out the window once you buy Hidden Drive from Hidden Drive Company.
Probably better just to use a veracrypt hidden volume, and preferably not a SSD.
Why not an SSD?
SSDs are hard to completely sanitize
I thought that spreading the writes and bytes around for even wear would make it even harder to piece together data from a dump without a partition table.