Remember that the rear one needs illumination.
The UK plates were square and fitted under the taillight, there was a clear section in the light to illuminate the plate.
Some Australian ones have a plate carrier that fits to the central rib as below (Series III). Not sure when these were first used.

I fitted one to my Series I in the same place you've chosen. Made a backplate that also hold the light and pivots so that you can run with the tailboard open & still (sort of) see the rego plate.

Colin
'56 Series 1 with homemade welder
'65 Series IIa Dormobile
'70 SIIa GS
'76 SIII 88" (Isuzu C240)
'81 SIII FFR
'95 Defender Tanami
Motorcycles :-
Vincent Rapide, Panther M100, Norton BIG4, Electra & Navigator, Matchless G80C, Suzuki SV650
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