If you prefer you can have your own separate sub-classes for either/both the models and the views. In that case you would indeed need separate classes for model flags/item delegates. (In the case of delegates you can also have separate sub-classes for the view but both using the same delegate class, if desired.)

Or, you can share the same model and/or view sub-class for both your tables, instead of having different dedicated ones. You would put into them some member field of your own to indicates which model/view each instance represents. Then you can use that in your flags or delegate methods to decide e.g. which columns to edit or hide based on which model/view your instance represents.

What does your "noneditabledelegate" do ?

to make columns non editable

As already said, that's not the role of the delegate but the model flags method.

What does your "noneditabledelegate" do ?

to make columns non editable

It's not the role of the delegate to decide what is editable or not, the model flag function is there for that reason.

What does your "noneditabledelegate" do ?

If you need several different delegates to support suffix, then derive them from the original one providing support for suffix.

class SuffixDelegate : public QStyledItemDelegate{
Q_OBJECT
Q_DISABLE_COPY(SuffixDelegate)
public:
explicit SuffixDelegate(QObject* parent = nullptr) : QStyledItemDelegate(parent){}
QString displayText(const QVariant &value, const QLocale &locale) const override{
return QStyledItemDelegate::displayText(value,locale) + m_suffix;
}
void setSuffix(const QString& val) { m_suffix = val; }
const QString& suffix() const {return m_suffix;}
private:
QString m_suffix;
};

Now you can:

auto rpmDelegate = new SuffixDelegate(this);
rpmDelegate->setSuffix(QStringLiteral(" rpm"));
auto hpDelegate = new SuffixDelegate(this);
hpDelegate->setSuffix(QStringLiteral(" hp"));
view->setItemDelegateForColumn(9,rpmDelegate);
view->setItemDelegateForColumn(8,hpDelegate );

How to add unit or text with data in tableview column ?

Subclass QStyledItemDelegate and reimplement displayText. Something like:

QString displayText(const QVariant &value, const QLocale &locale) const override{
return QStyledItemDelegate::displayText(value,locale) + QStringLiteral(" rpm");
}

same i need to do for a Qlineedit

Don't use lineedit, use QSpinBox/QDoubleSpinBox (you can call spinBox->setButtonSymbols(QAbstractSpinBox::NoButtons) if you don't want the buttons). They already have support for prefix and suffix