This how I attach Zulu style straps to watch heads using the fourth/fifth "extra" ring on the six o'clock side for the purpose to reduce strain exerted on the springbars and hence reduce the chance of a spring bar failure.
I strap Zulu/NATO style straps rather tightly before getting into water, since most of these straps tend to stretch somewhat when wet.
For comfortably wearing four/five ring Zulu style straps attached this way on a relatively thick wrist or over a diving suit a strap length of about 300 mm (12 inch) length to make up for the extra loop is preferable.
When this is not long enough, Zulu style straps with a strap length of about 430 mm (17 inch) are also available.
