2 transducers, 1 boat

This is my second boat electrical question in as many days. You guys were so helpful with the first one, I'm doubling down with this one on day two.

I have my primary sonar/GPS unit mounted at the console. It's a little bit older Hummingbird unit with an 83/200 transducer. It marks fish and tells me where I'm at so I don't really have any reason to replace it.

I have a Lowrance Elite 4x that I use as my ice fishing unit. It also has an 83/200 transducer. I just so happen to have an extra boat transducer for it.

I would like to mount the second unit on the back of the boat. Turns out when you're trolling you do a lot of looking backwards.

So here's my questions:
1. Can I use both of these at the same time? On the same frequency or different?
2. Should I mount both transducers on the same corner of the stern or opposite sides of the stern?
3. If I mount them opposite, will the prop of my kicker screw up the signal of the second one since it would be on the port side with it?

Regarding #1, I should also say that I can read both of my sonar units on 200 Hz, but I can't decipher the display on 83 Hz, so I'm really hoping that they can operate on the same frequency. I'm also really hoping that I can operate them at the same time. It's nice to be able to drop a pin where you catch fish. It's amazing the picture you can put together after just a few hook ups.

Thanks in advance!

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2 transducers, 1 boat