Because of the hollow design of the spacers you are able to just leave em in and grout right over them.
TROXELL Leave-in Spacers
$6.39 – $7.19
Save time on installs. Leave spacers in and grout over. Hollow design allows grout to fill spacer and keep in place without cracking or popping up.
Hard plastic maintains shape and will not compress providing accurate even spacing.
Traditional X, Brick pattern T