Hi Saintflo,
thanks for posting.
Wearing the SPEED_CELL on the shoe laces using the lace clip or in the cavity of miCoach compatible shoes will allow for highest level of data accuracy. If it is used in any other way than recommended (with lace clip or in cavity), adidas does not guarantee the same level of data accuracy. So both ways will provide you accurate results, however, some users have noticed that when jogging with the miCoach App, sometimes the body obstructs a bit the signal from the SPEED_CELL to the CONNECT. But as I read in your post, this would not be your case since you will use it for a tennis match and I guess that in combination with the Tennis App and by itself. So, in that case, where you place it (shoelaces or cavity) shouldn't make a difference.
If you wear the clip, indeed is easier to place and it will start recording right after you put it taking out the movements on the way to the court but also if you place it before in the cavity and you want to get rid of movements while going to the court you will only need to crop the data you don't want/need once you sync your SPEED_CELL.
If you have further questions, please let us know.
MissTennis1
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