When I service my 400E, I always put them under the front lower control arms, and don't know how it can harm for a short period of time, let me know if I am wrong.
99 BMW 540i 6-speed 110K Km
03 SAAB 9-5 wagon 80K Km
92 400E (Sold) 245K km
Still missing the days with the Benz, it kept me busy.