Piggies must not walk on wire at all - it wil cause injuries and potentially bumblefoot.
Piggies need to walk in solid ground.
Also, angle of that ramp - if the picture is how it is in real life - is also not suitable. It is far too steep for a guinea pig to ever use.
Normally we would suggest putting a brick underneath the bottom of the ramp to raise it up but the ramp in the picture is far too short to be able to do that.
Therefore the ramp is actually entirely unsuitable for guinea pigs and should be removed.
You will need to make a new ramp out of something solid like wood and then cover it with something with grip (ie carpet) for the piggies to be able to use a second level of the cage.
I added in our ramp guide which shows more
Ramps in Cages and Hutches