How many 70-123 for each screen?

A handy person from Philadelphia says:
July 27, 2016
How many of these clips should I use for each screen?

1 on each corner (4)? 1 for each side(2)? 1 per screen?
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Paul from SWISCO responded:
August 1, 2016
Hello! The window manufacturer recommends two 70-123 clips per screen.
Patriot Screen Clip
Patriot Screen Clip
70-123
$0.52
SWISCO Patriot Screen Clip
SWISCO Patriot Screen Clip
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