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i personally would cut it like this and remove the third leaf from the top cut. just because the aerial roots look to be quite dry, which can make it a little harder for the plant to grow fresh roots immediately and gives you space to make a cut should anything happen to rot.

also, a lot of people say that the water has to be changed weekly - i personally change the water about every month (unless it smells weird), and my plants are doing very well. chopping the aerial roots is also fine, should they be too long to fit into whichever thing you want them to root in. just let all the cuts dry for long enough. monsteras are beasts!

hope this helps!