miktdish said:

sticky tape - to get it into place and stay there.

1 off 3mm HSS drill - drill 4 holes 1 in eash corner.
A pack of these screws ... 1000 maybe overkill, small packs and different sellers are available.

Fastco Fasteners & Fixings

Fastco Fasteners & Fixings, Leading distributors of Fasteners, Fixings, Screws Nuts and Bolts and More

www.fastco.co.uk

A piece of chalk/white marker pen and a rule - to mark out equally spaced points in straight lines.
Step back and check how it looks.
Drill as marked.
Remove the 4 corner screws and tape.
Paint the holes with Galvafroid (or similar) and let it dry.
Screw into place.

Drink tea, admire your neat work, do a little dance (last item is optional but good for the soul).

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