Mesa 7i96 Output Wiring

I appreciate the answer but now I'm even more confused...

Using this pic can you connect all the necessary wires that are needed to safely run a relay module of this type?

image missing https://i.imgur.com/ZwsL3Vs.png

Look like it would be wired
+24V --> DC+ 7I96 OUT+
0V --> DC-
7I96 OUT- --> IN

Though a plain relay would be sinpler

Like this? Also, can you specify a plain relay you would prefer?
image missing https://i.imgur.com/0LFIjMf.png

I was thinking of simple DIN rail mounted relays but they seem to be more
expensive unless you buy direct from China

PCW wrote: Both are correct.

If you use the second scheme you should definitely fuse the 24V supply
since a short to ground (assuming 24V common is ground)
would likely damage the 7I96 output

Note that you should have flyback diodes across the relay coils

Am I correct thinking the diode positive (striped end) should go to 7i96 OUT+ (and can put the diode negative to OUT-)?

No, the diode should be across the relay coil

for example
Sourcing drive:
+24V --> OUT+ --> OUT- --> COIL+ --> COIL- --> GND

or
Sinking drive:
+24V --> COIL+ --> COIL- --> OUT+ --> OUT- --> GND

Diode always goes from COIL+ to COIL- (cathode=band to COIL +)
If you are unsure, test the relay+diode with a mechanical switch
replacing the 7I96 OUT+- pins