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Sebastian- I used Zu Def Pro for more than a year and loved them. Your room is large enough as long as you can separate the speakers about 8 feet apart or more and place them at least 10 feet away from listening position. Proximity to walls is not a problem but keeping them at least 2 feet from sidewalls is advisable.
Do you know that they have to be bi-amped and that an outboard crossover is needed?
For shipping quotes you should contact shippers and ask them.
The speakers are exceptional and will reward you handsomely if you don't mind the complexity necessary to power them.
A dbx Drive Rack might be a good choice for crossover. I had the Rane PEQ 55 that Zu recommended but many other users switched to the dbx and raved about it as an upgrade.
Your links are timing out for me, so I can't see what your room looks like. But if Macro says the big Zus will work in your room, I'm sure they will.
As for shipping companies, I go first to freightquote.com in situations like this, but you'll probably have to open an account with them. Or perhaps Zu or whoever you are buying from can check with them.
If you want to do air freight instead of surface (ocean), you can also contact airlines to see what their rates are, airport-to-airport.
Your English is quite good, by the way. You don't even have an accent.