Need Help With -ra suffix

Hello everybody, I have a quick question. I was learning about the pluralizing suffixes -ra and -tachi. My problem is mostly with ra. For example, while "kore" means "this", "korera" means "these".

eg. Korera wa hana desu.
These are flowers.

Now my problem is using -ra with kono. If I want to say these flowers are red, how would I say it using the -ra construction.

Would it be:

Konora hana wa akai desu.
or Korera wa akai hana desu.

(basically I want to know how to use it with kono and sono etc.)

Thanks in advance.

I would say:

korera hana ha/wa akai desu.
これら花は赤いです。

The possessive particle の[no] is needed.

これら/それらの花は赤いです。
Korera/Sorera no hana wa akai desu.