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Of course, the deck plate is used to cover unused holes, if you already have one or it is just for one hole installation, it’s no need to use the deck plate.
No it will swivel 360degree, it’s convenient use for double sink.
Yes, the lever can be installed in the front or any position you would like, as the spout can be rotated 360 degree.
Yes, it is up to you, exchanging it have no effect to the single handle faucet. I did that before and asked the company for that.