Offer in Amazon.de for the Xiaomi AX3600. One to the bag straight away 
Almost the same price as the ASUS RT-53U (AX1800U) I was also planning to buy but double the best in all senses. Maybe in EU the only better alternative is the Dynalink WSM because of the 2.5GbE WAN port. Unfortunatelly, that product is not going to see my office anytime soon.
Now with this + my ZyXELs AX1800 (Multy M1, WSM20), I'm done for a couple of years Hope we can hack them anytime soon