The SERA-rule mentioned by lhe is very relevant if you want to use the new EIR, where you take of and land VFR. The transition point to and from IFR has to be at least 1000 ft above the highest point (terrain or obstacle) within a radius of 8 km.

I start training for the EIR next month and would like to continue using SD. But apart from this MSA issue, SD also has to unlock the flight rules part of the flight plan filing. For now, it only allows V(FR), where I will need to file a X-plan (VFR-IFR-VFR).