What is the relationship between the participles to the main verbs in Ephesians 6:10-20?

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I am trying to prepare a talk on Ephesians and as part of my preparation/exegesis, I was attempting a grammatical diagram of Ephesians 6:10-6:20 using the UBS5 text. I am doing this in order to understand the argument of the author and am focussed on tracing the argument using subjects, verbs and objects used.

Two verbs that form a part of the core argument are:

1. The present imperative of στῆτε (v14) – Ephesians 6:14 (UBS5): “…στῆτε οὖν περιζωσάμενοι…”;
2. The present imperative of δέξασθε (v17) – Ephesians 6:17 (UBS5): “…καὶ τὴν περικεφαλαίαν τοῦ σωτηρίου δέξασθε καὶ…”; or

I am trying to understand the to which, both, or something else the ‘qualifying’ the following participles relate:

• προσευχόμενοι (v18) – Ephesians 6:18 (UBS5): “…διὰ πάσης προσευχῆς καὶ δεήσεως προσευχόμενοι…”
• ἀγρυπνοῦντες (v18) – Ephesians 6:18 (UBS5): “…καὶ εἰς αὐτὸ ἀγρυπνοῦντες ἐν πάσῃ…”; and
• [προσευχόμενοι] (v19 – Ephesians 6:19 (UBS5): “…καὶ ὑπὲρ ἐμοῦ, ἵνα μοι…” implied in “…καὶ ὑπὲρ ἐμοῦ…”)

Any ideas which is it and on what basis?

Thanks a lot for any pointers.