It should not be a problem, since they have the same explanaiton of the Cross as the Orthodox:
As always, it’s multilayered (in the Eastern we do nothing simple).
The three are first the sign board that Pilate put “INRI” (IHBI for the Greek/Slavonic), and the footrest of the Cross.
The Three remind us of the Holy Trinity.
The slanted one is because of the agony of the Lord, he wretched it out of its place. It is to show He truly suffered, not just appear to suffer, and really bore our sins.
Btw, it is NOT, as I’ve heard Polish Latins say, that we believe that Christ had one foot shorter than the other.
It is the Balance Beam of the Cross. Both thieves blasphemed, one repeneted and entered paradise (Orthodox icons of paradise show the thief opening the door leading the souls in), the other challenged Christ to come off the Cross, and he went down blaspheming. Hence the slant up (the good thief on the right) and down (the blaspheming thief on the left). All our actions and ourselves stand in that balance beam.
Below the Cross you might see crescents (

) or a mound with a skull. That’s Adam’s skull (Golgatha), the Blood dripped on it. There are often inscriptions: my favorite is “Calvary has become the Mount of Paradise.”
Hope that helps.