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NotThamesWater
Wood adhesive forms a bond that is stronger than the wood itself when used properly. I can't find any information about the strength of a wood to wood bond for that 3m stuff but can tell you it's designed to soak in so may affect finishes you plan to use. Plus I personally like to avoid wearing a respirator when glueing as it can be stressful enough without adding being uncomfortable to the mix.
I'd use wood glue: titebond 2 at a minimum as it is water resistant when dry. It's more expensive than say bostick PVA but has a more liquid consistency so can be applied with a notched adhesive scraper or a foam gloss roller. Really though your choice of adhesive should be determined by the open time (the amount of time you have between spreading the glue and joining your workpieces) that you need; titebond 2 has a 5 minute open time titebond 3 has a 10 minute open time and the cold press veneer stuff is 15 although this is an interior only glue that offers no water resistance when dry. If you're unsure go for a longer open time although this will add to the cost.
As @stevo_com says clamping is important although in this instance I'd lay the sheets of ply flat and put some heavy stuff on them spread out as evenly as possible. Think dumbbells / bag of sand / you could even lie down it for 30 minutes if you felt like it.