Interface suggestions needed

[Chris Frost]

Hello everyone, just found out about JamKazam this week and our band wants to start using it. 

I'm looking for some suggestions on interfaces to use. 

I play guitar in the band, don't sing. I already own this unit,

https://www.behringer.com/product.html?modelCode=P0B2J

I know it is overkill but I already own it. I do like to play in stereo so I will make use of at least 2 of the channels. Any known problems with this unit?

There are 3 other members in the band and they are all going to need interfaces, drummer, bass player who sings, other guitarist who sings. 

I'm assuming a 2 channel interface would be a good choice for them, 2 channels for the drummer so he can be in stereo, 2 channels for the other two guys, one for their guitar the other for vocals. 

I have a 16 channel mixer the drummer can use to mic his drums and mix that into the interface. 

Any suggestions on my thought process here? Any suggestions on what interface the other 3 guys should get? The less expensive the better but I don't want to buy something so cheap it isn't going to work well.

Thanks!

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Forgot to mention the bass player/backup singer uses an iMac, the rest of us use Windows.

There are some other posts on this forum regarding Audio Interfaces (please search through to find the list).  You need a ‘Low Latency’ one ... but I suspect that they all offer that.
I personally use Focusrite Scarlett 2i2 ... 2 channels (and I only use one of them as I play Saxophone).  I have seen others mentioning the Behringer units and even some of the ‘USB Microphones’ (which might work for a vocalist).

If I were starting now (with what I know) - I would probably go for a 4 channel unit - as that would make it easier to play backing tracks.

Your drummer will need more mic inputs than ‘left & right’ - not sure what latency might be introduced by that mixer - but try it out anyway.