Why 这么 / 那么 are placed before the action verb? I have some confusion with the use of 这么 (this, so) and 那么 (that, so). I found these examples (from Pleco):

大家都这么说。
Dàjiā dōu zhème shuō.
Everyone says this / so.


你不该那么做。
Nǐ bù gāi nàme zuò.
You shouldn't do that.

where 这么 / 那么 are placed before the action verb. Grammatically, I understand they are pronouns acting as the object of the verb. However, in Mandarin typically the object goes after the verb. What is the rationale for placing 这么 / 那么 before it? Are they an exception to the standard order of verb + object?
[这么 +v ] = [v + like this/ this way]
[那么 + v] = [v + like that/ that way]
Example:
大家都[这么][说] = everyone [says it] [like that]
你不该[那么][做] = you shouldn't [do it] [like that]
~
[这么 + adj ] = [ this + adj]
[那么 + adj ] = [ that + adj]
Example:
[这么][坏] = [this][bad]
[那么][好] = [that][good]