Hello everyone,
is the port the same everywhere in the world?
I tried to give the device permission to find the port itself.
I got a port 6100? Which port is the right one in Europe?
Have read that the port 8333 should be correct.
It's always port 8333. Bitcoin doesn't care about your location.
I also only have a maximum of 10/32 connections.
What are more connections good for?
More connections means you're seeding the blockchain to more users / nodes, so it's always good to have many connections. I have typically over 100 on my node (not an Apollo though).
The miner can only mine 3Th. It doesn't matter, doesn't it?
Mining has nothing to do with the node software running on the device. It's just 2 programs in one box in the Apollo. You run a full node
and a miner. Many full nodes don't mine, so the hashrate has no impact on the number of connections, no.
Connections are important but whether there are 10 or 30 connections should not burden such a "small" miner?! Small and sweet...

What is the reason?
No, that's not a large amount of connections, I don't think the software will allow to have more connections than what it can handle.