I can't really help you since I have only a few RDTAs and probably none of em would be good for you... not what you looking for...
Here some rdta with center post fill/ deck hole fill... most of em deck hole since center post seems rare to me.
I didn't include side hole filling RDTAs like the Cabeo or Pyro V4. Tho the two are very similar. Guess deck hole a bit more leak proof when it comes to refilling... but side hole is more leak proof while your stuff lying on its side. But you asked for deck hole, so here they are
SKU 9647443 Coil Father King RDTA
Center post, dual coil, DL, ?6,5 ml?
SKU 9748623 Hellvape Helheim RDTA
Deck hole, dual col, DL, 4,5 ml
SKU 9733463 ThunderHead Creations THC Artemis RDTA
Deck hole(-ish), Single coil, DL, 4,5 ml
SKU 9752535 ThunderHead Creations THC Artemis II RDTA
Deck hole(-ish), Dual coil, DL, 4,5 ml
SKU 9728552 Wotofo Profile RDTA
Deck hole, Mesh/coil, DL, 6 ml
SKU 9659128 Vandy Vape Pyro V2 RDTA
Deck hoel, Dual coil, DL, 4ml
SKU 9660876 5GVape Leopard RDTA
Center post hole, Dual coil, DL, 4ml
For me the leopard seems the most interesting stuff even watched a video on it since it lacks good pictures here... But here's all the deck-hole/center post hole fill system RDTAs with 4 or 4+ ml capacity I could find here on FT....
As I said, this is not really my cup of tea (DL/dual coil stuff), I tried none of these so you better ask anybody else... maybe if you find something interesting you can ask how did it perform from the others I mean specifically that one RDTA you interested in. And thanks the tip... you didn't had to, i do this for my own reasons.... my wish list just got even longer while i was looking through these stuff :D