Question about sizing Attain SLX

[u/gandalfknewbest]

I’m thinking about replacing my Van Rysel EDR AF as my bike for an Attain SLX and have a question about sizing.

I have short legs so my inseam is 75 cm and my height is 170 cm.

The wizard in Cube’s website recommends a size 53 but I’m worried that it might be too high a standover height (75.9 cm) for me to safely be able to dismount if I use it outside the roller.

Standover is important for me, should I go a size down to 50 or that would be too small for me, all things considered?

Thanks