Eibach will eb fine on Euro M-sport suspension. The drop isn't that much so you wo't unduly affect the opertaion of the stock shock. If you plan on dropping more then you'd need 'matched' shocks as well.
Many report Eibach to be great with standard shocks, but not sure if you'll get 1" out of them as I think the specified drop or 23/35 is over standard ride height and not M-Sport, so it might only be 15-20mm drop over all with M-Sport as its already lower than standard.
H&R have a bigger drop but this might musg you towards the limit on M-Sport shocks.
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2014 [14] M135i, 3dr, MG, Auto, SP, CP, HS, HK and FBP
Recent Past.....
2011 [61] Abarth 500, Funk White, Leather, H&R
2007 [57] 320d M-Sport Touring
Pre 2007 - GT TDI 4MO, Mk4 R32, A3 TQ, A3T, Cupra R and on and on and on.....