Be careful with the 2Mbit or lower - it is a good rule of thumb only - seen some FEL that are very low - down to under 200Kbits (not that there is much there - but it is FEL).
For example all IP Man tiles are FEL and well under 2Mbits.
On the top end the max I have seen for an FEL is 19Mbit, iirc Ronin was the largest I have seen so far.
Looks like makemkv is the easiest to place to check your mkv’s, and it is getting it correct from the outliers I checked.