correct. Only looks funny because everyone is used to seeing it the other way. At the end of the day its personal preference but I at least suggest looking into it. There are several videos about the pros and cons of each way.
see here.
View: https://www.youtube.com/watch?v=zrrlxEwUaRM
If you are putting a red dot on it you really shouldn't be worried about the sight radius unless the dot goes down and if that is a primary concern you should not be putting a dot on a pistol anyways. I trust my RMR. The sights are only there to help co witness but you want primary focus on RMR otherwise why put it on? I cut my slide like this and I love it. in the even the RMR goes down I can still hit the plate rack at 100 feet with decreased sight radius no problem