Your list could be made for anything through being selective about what is on the list so it doesn't really mean much but in any case, let's have a look.
Round earthers all believe the same thing? That's a laugh! There are just as many variations of RET (if not more) than of FET.
Some things that round earth people are generally in agreement about that flat earth people generally have no coherence in their group view:
The size of the Earth No, they don't.
The layout of the countries There is disagreement.
The existence of Antarctica This is also agreed upon in FET.
The orbit of Earth round the Sun Some believe the sun orbits the earth.
The orbit of the Moon round the Earth There is disagreement.
The distance of the stars No one can really know the distance of the stars.
I could go on, but I can't be bothered.
And before you start nitpicking that "some people think the stars are only about 100 miles away and the moon is cheese, even though they think the earth is round" I'm not talking about people who have differing beliefs through ignorance. If you got someone who thought the stars were 100 miles away, and sat them down and explained clearly, using examples they could understand, that science can demonstrate their distance and how it does it, after that they would believe what science has shown them. Flat earth theory fails to be able to do anything like that and that's why people will always be more likely to believe round earth theory, even if it isn't true - because it can be demonstrated to at least appear to be true within the limits of provable knowledge.
Wow, six things that round earthers agree on and they weren't even.
1. Size of the earth - what order of magnitude is the disagreement in Round Earth Theory? I believe the discrepancy between views in FET is from a few thousand miles up to infinity or anywhere in between.
2. Again, what is the order of magnitude of disagreement about the layout of countries in RET? See the different maps put forward by the different flatters and tell me there is that much dispute about any of RET geography.
3. Some flatters believe Antarctica is a seperate island on the Earth (I think Wilmore subscribes to this map, among others) whereas some think it's an ice wall round the edge rather than a discrete continent, so your statement that there is agreement in FET is laughable.
4. People who believe the Sun orbits round the earth fall into the category of simple ignorance. Those who are not educated to a proper standard or educated using plain wrong ideas that contradict observable evidence would change their mind to the correct view if shown how science etc etc etc read the whole bloody post next time etc.
5. What sort of disagreement? Who thinks the earth is round but that the Moon doesn't orbit round it? Give names.
6. The distance of the stars: Yes we can estimate their distance using several different and unrelated techniques, but I'm sure you think it's all lies as the answer is more than 3100 miles.