Suggest for placement of ADT/Ademco wireless window sensors

[canyonblue@xxxxxxxxx]

I am having an ADT system installed (ADT direct, not a reseller) and
will be using their rebranded Ademco wireless window sensors on 18
windows on my main level. The windows are new, warrantied, and white
vinyl which is why I am going wireless.

The problem is related to my window blinds. My two inch blinds (which I
always leave in the full down position but swivel open and close daily)
leave less than a 1/2 inch between the back of the blinds when open and
the window surface. This appears to be less than the depth of the
sensor if we place it on the vertical side of the lower window (they
are single hung windows that have the bottom window slide up and down).
This would push the blinds out a slight bit (they would be touching the
sensor) and that seems unacceptable. The same issue exists if I mount
the sensor to the bottom sill as the blinds would rest on the sensor
which  would look bad and perhaps cause the same issue. I can't mount
the sensors horizontally on the top corners of the bottom window (with
the magnet in the track) because the latches for the window to rotate
into the house are located there...

The only place left I can think of? DEAD CENTER of the horizontal top
of the bottom window with the magnet on the glass surface of the upper
non-moving window. Do you think this will be horribly ugly? The sensor
matches the color of the white vinyl windows and the blinds should help
concel the boxes but I am really concerned about the look of the whole
deal.

Any suggestions on other mounting options.