I have ordered Arctic Liquid Freezer II 240 for LGA 1700

Yes, of course that is possible. You can also fix the fans a little higher with the brackets if necessary.

Yes it is. See: https://geizhals.de/arctic-freezer-34-esports-duo-weiss-acfre00061a-a1973320.html Performance-wise, it's good so far. But for a quiet system I would rather go for a Pure Rock 2 Black: https://geizhals.de/be-quiet-pure-rock-2-black-bk007-a2279768.html

Ist im Installationsbeschrieb erwähnt https://support.arctic.ac/index.php?p=freezer34esportsduo

Yes, in the 465X the max. height is 17 CM. This cooler is approx. 15 CM.

0.8g of MX-4 https://www.arctic.ac/Freezer-34-eSports-DUO/ACFRE00061A

It might fit, but it's just a bit tight. I myself have installed the cooler in a case with a maximum CPU cooler of 16 cm. Fits perfectly. I can only recommend the cooler to you.

A Y cable is included with the cooler. One connection on the mainboard is sufficient.

Hello Noé Yes, the backplate is supplied with everything. Simply when assembling you have to make sure that you get the right hole. Greetings

...yes, MX-4 thermal paste.

2x 4pin adapter plug PWM to 1x 4pin plug PWM !!!!

Yes. TDP up to 210W.

The AM4 backplate is included with your motherboard, replacements are available through arctic support. See: https://www.arctic.ac/ch_de/freezer-34-esports-duo.html

Jo that's enough, in my opinion.

Loose have the same