How do I install quarter round when I have a concrete slab?

I just layed down laminate flooring and need to finish it off with quarter round. I can fasten most of it to the baseboard. I have a few areas under the door and around the fireplace where there is nothing but metal or a marble slab. How can i install the quarter round in these areas? I was thinking some type of adhesive. But I don't want it to look jerry-rigged.

I would use Liquid Nails Clear. You can use it and spread it on the quarter round. Try off setting small dabs so that they can help to hold the quarter round in place. Make sure that you hold it firmly against the metal or marble slab until it takes hold. Use it sparingly but work quickly. Good luck to you and to your project. Hope it works out.

It is a jerry can (gas can) or jury rigged, not jerry rigged, but glue is good, actually you have no choice. You can glue it to the laminate, instead of to the fireplace, etc.

Appears that you have to use adhesive.
Use "Liquid Nail", comes in a tube. You don't need to spread all the shoe mold. Spot glue like you would nails, and glue to the floor. You won't have glue on the fire place.

use liquid nails

I have used PL-200 construction adhesive.

I use "Gorilla Glue" for this all the time, besides your concrete slab has nothing to do with this, since you are not supposed to nail the "Base Shoe" down to the "Floating Floor" anyway.

I'd use a good quality clear silicone adhesive

use liquid nails

In this case, depending on fit, you may want to 'plough' (remove some of the wood stock) from the back. Now the top profile will fit snug against the adjacent surfaces. Use a PL product 400 to adhere to surfaces. You may need to prop the glued stock against the surface until it bonds, overnight should be fine.

Quarter round should only be going where the baseboard is. Why would you put it under a door? If the edges of your laminate are exposed under the door, you didn't install it correctly. You were supposed to trim off the bottom of the jamb and slide the flooring under it.

Never fasten shoe molding (or anything else) to the floor itself. The floor is supposed to move, and nailing through it or gluing something down to it will stop that movement and cause buckling. It is supposed to be nailed or glued to the baseboard.

Elmer's carpenter glue in the hand held bottle works for me, good luck!