The porch feels narrow. I would consider widening it with flagstone. Liriope is invasive, consider alternative plantings.

Here is one option for the porch with two versions:

Try creeping phlox instead. Get them as plugs. Then, put in a lot of bulbs because they're easy.

I have heard that the variegated liriope isn’t invasive, but after my neverending battle with plain green liriope, I wouldn’t chance it.

How invasive liriope may be depends on species and location. Liriope spicata - like most good groundcovers - is rhizomatous and can spread aggresively if conditions are suitable. Liriope muscari is a clumper and generally considered well-behaved in a garden setting. Both species come in a variegated form and like most variegated plants, tend to be less vigorous or aggressive in their growth habits compared to their solid green cousins. I would not hesitate using L. muscari in this situation.

But any good groundcover will do. I am not a big fan of creepig phlox - it is not fully evergreen, looks ratty in winter and has a limited bloom time/season of attraction. YMMV

I agree about widening the terrace before adding edging plants. At the moment you can hardly walk around the chairs and pillars without treading on the garden.