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They go right at the ends of the axle next to the crank. You'll have to assemble it to make the decision how many and what side. Basically once it's tightened up, see how far the axle slips side to side to decide how many you need and measure the distance to the stays on each side to decide what side(s) to put them on.
Bear in mind if it's a threaded 68mm shell with three spacers to take it up to 73mm, if you're using plastic spacers it's common for them to compress and cause side to side movement. Metal spacers solve this.
Also bear in mind if you've got the threaded Race Face Team XC bottom bracket, they've got notoriously poor bearings in them. Wrong type of bearing for a bb or something. Check the play is actually in the axle and not a shagged bearing. Swapping to a Shimano BB52 solves this.
I've got some Race Face Evolve XC cranks (~2007) and I've bought a spindle spacer rebuild kit as the last time I used them a few years ago they had some wobble. I have no idea where to put or how many spacers I need though. I've struggled to find a manual online, all the links on the RF website are dead.
I've got 3 solid 1mm spacers (the red and 2 right black ones) and one squishy rubber 2mm one (left). Going into a Shimano HT MTB BB on a 68mm shell with 3 BB spacers.
Any ideas anyone?