First rig, I'd like to go simple and start with throwing 2-3 RX 570 on a motherboard without building/buying a dedicated frame.
A board that would
look like this.
Possibly with less slots (let's say 4). Ideally, I'm looking for something with a brand name or some forum rep' and a European warranty

This mb seems really easy to use. But won't the cards get too close to each other and affecting airflow?