The TEMO comes with the Rowlock fitting which contains screws and bolts for attachment.
https://www.temofrance.com/en_GB/shop/t450-temo-450-104
Rowlock
https://www.temofrance.com/en_GB/shop/sem-1500-rowlock-fitting-9
On a Weta I’d recommend using the bolts and installing a curved metal plate under the gunwale to reinforce it.
I have tried to contact Oliver via the French Weta Class forum without success – there’s a thread here.
https://forum.wetaclassefrance.com/viewtopic.php?t=883