Readily available ones vs. Local Iron Smith, choose the one with medium to heavy gauge(<=14 gauge) and a good protective coating(hot-dip galvanized or powder coated) with reasonable price. Stand made from pre-galvanized sheets do get rust after sometime.
If mounting location is without any side walls, in case of high winds the panel may fall if not anchored properly to the ground. Making concrete blocks on the feet of stand is an option without anchoring, but how much wind will it resist is questionable.
Standard direction in Lahore is 30-degrees and True-South.(Magnetic-South and True-South of Lahore is almost same)
6mm. sq. wire for 450W panels at about 15V is ok, if the length is not too long.(high current causes voltage drop on long wires)
Do switch on your AC-line of UPS in evening or else the battery will be consumed in the night.