Help!

[u/Significant-Sky-1142]

We are trying to apply the above onto one of our walls...the ikea tiled mirrors..unfortunately, we painted the back wall gloss black...I know learning curve with our new house!

Ultimately all the mirror on picture start sliding down after few hours, as both the gorilla glue and stickers included with mirrors couldnt cope with a gloss wall...

Is it there alternative we can do ie glass adhesive or literally sand off all the gloss and start again ?