Your profile says “ocean” ?
your post says “Beach” - may help future queries is you correct this.
As mentioned above, Make sure you check the size & height of any fridge if you intend storing it under the multiflex.
The multiflex in a beach differs from an ocean In height.
T6 Beach, I have a cfx 35, able to live out if that easily and you can stand a standard wine bottle up in it - consider what you will put in it when in use!
owned my CFX 35 for over 4 years, it was a game changer as far as storage of food and drink in warm climes, enables you to shop and store food and drink for a few days for four people, longer for two.
previous tent camping using a cool box vs Compressor fridge = night and day. The compressor fridge / freezer is like having your home fridge freezer with you camping
you can set it up at home, pre chill / freeze what you want to take initially without putting a draw on the van leisure battery.
if using purely as a fridge, Setting to a frozen temp initially for a short period of time when at home on 240v wall socket for 20 minutes immediately prior to placing the fridge / freezer In the van, then setting to a fridge temp works well As the fridge does not need to draw the battery straight away, (you then start driving, which keeps the battery state good) .
as far as power usage on the LB it will last in excess of three days no problem and there is a setting on the fridge to choose a “safety” cut out for the battery level / fridge should the voltage drop to the predetermined level therefore protecting the LB from overdraw / drain.
can be used either behind passenger seat, in the boot area or taken out and put in awning. Dometic fridges are Expensive but IMO worth it.