PCB Design - RF SMA connector with Baluns

Layout
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Hi all,
I am working on a project that requires 8 channel signal being converted into 8 differential signal using ‘Balun’s’ or transformers.

I have made a basic 2 layer PCB design based on a schematic I found online using the components;
TCM2-63WX+; 1:2 CORE & WIRE Transformer, 30 - 6000 MHz, 50Ω | TCM2-63WX+ | Mini-Circuits
0.5 PF capacitor
and some random SMA edge connectors for the input and outputs. I designed the footprint for this SMA myself and based it off the mechanical dimensions.

My question is, what other things should I be thinking about to reduce crosstalk and any other problems? Trace width? I know we expect to be using 5Ghz signals. Any advice regarding current spacing and trace widths would be appreciated.

The Schematic has been included where it is 8 of the same, and the current pcb layout included as well. Would one ground plane and one copper plane be good enough? Should the signal trace be thicker than all?

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Thank you all

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This forum is primarily focused on KiCad-related help, so a design review / design suggestions is a little off-topic. Eevblog has a very active forum that is more focused on general electrical engineering help, which may be a better place to ask this anyways.

If you are new to high frequency design, I’d encourage you to look into the effects of stack up on signal integrity (as one starting place). There are good recommendations in older threads here or on eevblog, not to mention proper textbooks.

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