Those are car batteries and not made to be run down.
You really need proper deep discharge batteries, not car or marine.
Personally I don't waste my money on AGM or gel, but buy the wet cells. YMMV as not many people are comfortable with them.OTOH, i usually buy Trojan brand, but one of the pair below is Philippine cheapies for comparison.
As mentioned, the output from solar panels, measured in watts, varies over the seasons, location and day. so it is hard to give a definite answer.
Plus use and ambient temperature are the main considerations for a fridge/freezer.
You also need a decent panel to battery regulator charger. I use the C-tek D250S (dual solar panel and car alternator inputs). Some people like Redarc, but at 40Amps capacity IO think you are hammering at battery(ies)
We carry three x 120watt panels(bog standard house roof type mounted on boat rack
Two panels in parallel through a C-tek D250s charge up 225amphour bank of batteries, which we use to run our Evakool(?) 70l.
On a three week trip around Easter to Camerons Corner, day time max low 30s. with only the solar panels providing power, and running it fulltime as a freezer (4Amps/hour), they had no trouble keeping up. Half the freezer is just freezing water to make ice for the ice box which is the vege bin.
Also making sure you keep the Engels in a cool location will help reduce power demands. So, if they are under a canopy in the back, a little fan to such the hot air out of the top may save more power than a fan uses.
The single panel through anther C-tek D250S went into another 225amphour bank(2x6V 225 in series) to provide power for lights, electronics, etc. No problems there.
The bigger the battery, the more reserve you have for when the sun don't shine and the shallower you discharge the battery, which makes them last longer.
OTOH, if you strike a week of rain, then gennies win <bummer>
Suck it and see.