Thank you very much for having time to post this question.
The best option is to get a Stuart turner twin universal shower pump, if this is only for one shower then 2bar should be enough.
This pump is compatible for thermostatic showers, instead of traditional negative head which may create you issues on mixing hot and cold water.
Always, good to get an qualified plumber to check your plumbing installation before booking anything.
Hopefully this was helpful.
Best of luck!!!